如何为 css 生成的箭头添加框阴影？

Question

我在使用边框属性生成的箭头轮廓周围添加框阴影时遇到困难。有没有办法让盒子阴影的形状和箭头一样，而不是方盒子？

HTML:

<a class="bx-prev"></a>
<a class="bx-next"></a>

CSS:

.bx-prev, .bx-next {
  border-right: 15px solid green;
  border-bottom: 15px solid green;
  width: 35px;
  height: 35px;
  top: 200px;
  box-shadow: 0 0 10px 0 rgba(0,0,0,0.5);
}
.bx-prev {
  transform: rotate(135deg);
  position: absolute;
  left: 220px;
}
.bx-next {
  transform: rotate(-45deg);
  position: absolute;
  left: 320px;
}

Answer 1

试试这个。

编辑！

.bx-prev, .bx-next {
  border-right: 15px solid green;
  border-bottom: 15px solid green;
  width: 35px;
  height: 35px;
  top: 200px;
  -webkit-filter: drop-shadow(0px 0px 2px rgba(0,0,0,.7));
  filter: drop-shadow(0px 0px 2px rgba(0,0,0,.7));
}
.bx-prev {
  transform: rotate(135deg);
  position: absolute;
  left: 220px;
}
.bx-next {
  transform: rotate(-45deg);
  position: absolute;
  left: 320px;
}

<a class="bx-prev"></a>
<a class="bx-next"></a>

Answer 2

您可以通过使用伪元素创建相同的箭头来尝试使用模糊滤镜：

.bx-prev,
.bx-next {
  top: 200px;
  position:relative;
}

.bx-prev {
  transform: rotate(135deg);
  position: absolute;
  left: 220px;
}

.bx-next {
  transform: rotate(-45deg);
  position: absolute;
  left: 320px;
}
/*the arrow*/
.bx-prev:before,
.bx-next:before,
.bx-prev:after,
.bx-next:after{
  content:"";
  position:absolute;
  border-right: 15px solid green;
  border-bottom: 15px solid green;
  width: 35px;
  height: 35px;
}
/*the shadow*/
.bx-prev:after,
.bx-next:after{
  border-color: red;
  z-index:-1;
  filter:blur(5px);
}

<a class="bx-prev"></a>
<a class="bx-next"></a>

如何为 css 生成的箭头添加框阴影？

How to add a box shadow to a css generated arrow?

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